Expansion Preparation

[Rongway]

how long can I keep a wondrous tails?
If I pick it up after this Tuesday and complete it, can I give it back on the 13th?

If you pick one up tomorrow, the 13th would be the last day to hand that one in so you could do that if you're able to play on the 13th, but only just.

To be specific, the weekly reset is midnight PST going into Tuesday 14 Dec, so unless you're in Alaska, Hawai'i, or one of the island nations in this side of the date line, you have all evening on the 13th to turn your book in and also still pick up next week's book (for the week of 07 Dec - 13 Dec) before the reset, so you don't have to miss any Wondrous Tails weeks.